ABSTRACT
Crassweller, R.M., Ferree, D.C. and Nichols, L.P 1980. Flowering crab apples as potential pollinizers for commercial apple cultivars. J. Amer. Soc. Hort. Sci. 105: 475-477.
Kendall, D. A. and Smith, B. D. 1975. The foraging behaviour of honeybees on ornamental Malus spp. used as pollinizers in apple orchards. Appl. Ecol. 12: 464-471.
